Please note: while other sites use the MediaWiki software (often giving them a similar visual appearance) or have a name that includes "Wiki-" or "-pedia", only the projects listed below are part of the Wikimedia Foundation.

Wikipedia

Wikipedia is a project to build free encyclopedias in all languages of the world. Virtually anyone with Internet access is free to contribute by contributing neutral, cited information.

Wikipedia started in January 2001, and currently offers more than 24 million articles written in 284 languages. The largest Wikipedia is in English, with more than four million articles; it is followed by the Japanese, Spanish, German, Russian, French, Italian, Polish, Portuguese and Chinese editions, each of which contain more than 600,000 articles. Over 30 other language editions contain 100,000+ articles, and more than 200 other languages contain 1,000+ articles.

Wiktionary

Wiktionary is a project to create a multilingual free content dictionary in every language. This means each project seeks to use a particular language to define all words in all languages. It actually aims to be much more extensive than a typical dictionary, including thesauri, rhymes, translations, audio pronunciations, etymologies, and quotations. The project started in December 2002, and as of May 2013 is available in over 150 languages with over 16,000,000 entries in all. The largest language edition is English, with 3,380,000 entries. Then Malagasy, French, Chinese, and Lithuanian follow. All four of them have more than 600,000 entries each, while 24 other languages have more than 100,000 entries each. 73 other languages have at least 1,000 entries.

Wiktionary works in collaboration with the Wikimedia Commons. Many sound files have been uploaded to Commons to provide Wiktionary and other projects with examples of pronunciation.

Wikiquote

Wikiquote is a repository of quotations taken from famous people, books, speeches, films or any intellectually interesting materials. Proverbs, mnemonics or slogans are also included in Wikiquote. The project started in July 2003.

Wikibooks

Wikibooks aims to build a collection of free e-book resources, including textbooks, language courses, manuals, and annotated public domain books. It aims to help both (self-)instruction of students and teachers in high schools and universities.

As of May 2013, the largest Wikibooks is in the English language, with over 46,000 modules from over 2,600 developing books. The German, French, and Hungarian follow, each has over 10,000 modules. The project started in July 2003 and now has over 185,000 modules from over 5,000 developing books, across over 100 languages.

Wikisource

Wikisource is a multilingual project, started in November 2003, to archive a collection of free and open content texts. It is not only a superior format for storing classics, laws, and other free works as hypertext, but it also serves as a base for translating these texts. At the beginning, source texts in all languages (except Hebrew) were all on one wiki. However, Wikisource now has several editions in many individual languages.

As of May 2013, Wikisource offers 3,800,000 source texts in total. The largest is the French Wikisource, with over 1,350,000 works. Then German, English, Italian, Polish, Russian and Chinese with each containing over 100,000 source texts.

Wikispecies

Wikispecies is an open, wiki-based project to provide a central, more extensive species database for taxonomy. It covers living and fossil representatives of Animalia, Plantae, Fungi, Bacteria, Archaea, Protista and all other forms of life. Launched 14 September 2004, Wikispecies is aimed specifically at the needs of scientific users, and as of July 2014, has over 400,000 entries. There are plans to help Wikispecies collaborate with the Encyclopedia of Life project when the latter is more fully underway.

Wikinews

The Wikinews project was launched in December 2004 with the mission to report the news on a wide variety of subjects. Contributors from around the world write news articles collaboratively. Reports range from original reporting and interviews to summaries of news from external sources. All reports are required to be written from a neutral point of view.

Wikiversity

Wikiversity is a project dedicated to learning materials and learning communities, as well as research. It was set up as a Wikimedia project (in "beta" phase) on 15 August 2006 with the English and German Wikiversities, as well as the multilingual coordination hub. Despite what its name may suggest, Wikiversity is not limited to university (or tertiary) level materials, but is open to materials and communities of all learner levels. The way it can facilitate learning activities and communities is still being explored, but is centered around the model of 'learning by doing', or 'experiential learning'.

As of October 2010 there are over 30,000 learning resource entries across 12 languages. The English version contains over 13,000 and both French and German have over 2,000 entries.

Wikivoyage

Wikivoyage aims to create the world's largest free, complete and up-to-date world-wide travel guide. Wikivoyage was launched in January 2013 and is written by volunteers in the same spirit of sharing knowledge that makes travel so enjoyable. The project began in December 2006 as a German language fork of a site named Wikitravel, and joined the Wikimedia Foundation project family as a beta with 50,000 articles in seven languages. Wikivoyage is now available in 16 languages.

Wikimedia Commons

Wikimedia Commons was launched in September 2004 to provide a central repository for free photographs, diagrams, maps, videos, animations, music, sounds, spoken texts, and other free media. It is a multilingual project with contributors speaking dozens of languages, that serves as a central repository for all Wikimedia projects.

The project is growing rapidly. In December 2012, it reached fifteen million multimedia files, having surpassed 10 million in April of the previous year. Wikimedia Commons received an honorary mention for Digital Community at the 2005 Prix Ars Electronica awards.

The project has three community-driven mechanisms for highlighting quality contributions: Featured pictures which acknowledge the cream of the crop, and Quality images, which recognise well-composed creations by Wikimedia editors. Since 2006 it has run a Picture of the Year competition, which invites the wider Wikimedia community to share in the celebration of the inspiring free content imagery. Two pages, Meet our photographers and Meet our illustrators, showcase a selection of the highly skilled contributors who choose to use free content licenses and donate their work to the Wikimedia Commons.

Wikidata

Wikidata was launched in October 2012 and aims to create a free knowledge base about the world that can be read and edited by humans and machines alike. It provides data in all the languages of the Wikimedia projects, and allows for the central access to data in a similar vein as Wikimedia Commons does for multimedia files.

The data available in Wikidata is licensed under the Creative Commons CC0 License to allow third-party users to freely reuse the data available, unlike other Wikimedia projects.

MediaWiki

The MediaWiki open source community maintains several software projects. The MediaWiki engine is used by all Wikimedia projects and many other sites. Its core functionality can be expanded through extensions, customizations, and mobile applications. Developers can use the MediaWiki API to build applications interacting with sites like Wikipedia. MediaWiki welcomes technical volunteers for development, testing, system administration, documentation, design, and promotion.

Meta-Wiki

Meta-Wiki is a project used as a central hub for various coordination and organization tasks, such as discussions affecting multiple wikis or planning upcoming events. It has been used for a wide range of purposes, from documenting wiki philosophy to submitting grant proposals. Other notable uses of Meta include "Requests for new languages" and the public center for steward activity and some fundraising-related discussions. Like Wikidata and Commons, it aims to be multilingual.

Wikimedia Incubator

The Wikimedia Incubator is a wiki used for developing new wikis. In other words, it is where new editions of Wikimedia content projects (Wikipedia, Wiktionary, etc.) are created before going "live" to a subdomain like en.wikipedia.org or fr.wikipedia.org. Each wiki being created there is called a "test wiki", and is identified by a code for the project family (such as "Wp" for Wikipedia) and its ISO 639 code. For example, the Votic Wikipedia is being incubated as Wp/vot. Note that Wikisource and Wikiversity have separate "incubators", www.wikisource.org and Beta Wikiversity, respectively. Like Meta, Commons, and Wikidata, it aims to have its policies translated into many languages.

Wikimedia Labs

Wikimedia Labs is a project aimed to help volunteers get involved in Wikimedia operations and software development, and to make it easier for system administrators and developers to try out improvements to Wikimedia infrastructure, including MediaWiki. Wikitech is a site for internal technical documentation of Wikimedia infrastructure, and it is connected with the Wikimedia Labs project.